JP5529674B2 - Connection method and radio base station - Google Patents

Description

  The present invention relates to a connection method and a radio base station.

  In the LTE (Long Term Evolution) -Advanced scheme, a relay node RN (Relay Node) that can be connected to the radio base station DeNB (Doner eNB) via the Un interface can be used.

  The relay node RN is configured to perform radio communication with the radio base station DeNB via the Un interface and to perform radio communication with the mobile station UE via the RN-Uu interface.

3GPP TS 36.300 (V10.0. 0), "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Month (10-UTR) 3GPP TR36.814 (V9.0.0), “Further Advancements for E-UTRA Physical Layer Aspects”, March 2010 3GPP TS36.331 (V9.3.0), “Radio Resource Control (RRC); Protocol specification”, June 2010

  Here, in the LTE-Advanced scheme, it is assumed that a communication carrier sets parameters used in cells under the relay node using an O & M (Operation & Maintenance) server.

  However, the relay node RN is assumed to be installed for the purpose of expanding the coverage area, and the number of relay nodes RN to be installed may be enormous.

  Therefore, it may be difficult for the communication carrier to set parameters used in cells under all relay nodes RN.

  In addition, such parameters need to be set in consideration of interference conditions around the relay node RN and parameters used in the radio base stations eNB / DeNB and the relay node RN around the relay node RN. Considering such a situation, it is difficult for the communication carrier to set parameters used in cells under all relay nodes RN.

  Therefore, the present invention has been made in view of the above-described problems, and provides a connection method and a radio base station that can determine parameters used in cells under the relay node RN in consideration of surrounding conditions. With the goal.

  A first feature of the present invention is a connection method in which a relay node connects to a radio base station, and the radio base station uses the PCI, physical random access, and the relay node to use in a cell under the relay node. A connection method comprising: a step of notifying at least one of channel setting information, transmission power of a reference signal in the relay node, bandwidth, tracking area code, and reception noise figure in the relay node.

  A second feature of the present invention is a radio base station to which a relay node can be connected. In a connection procedure between the relay node and the radio base station, a cell under the relay node is connected to the relay node. It is configured to notify at least one of the PCI to be used, the setting information of the physical random access channel, the transmission power of the reference signal at the relay node, the bandwidth, the tracking area code, and the reception noise figure at the relay node. The gist is to include a notification unit.

  As described above, according to the present invention, it is possible to provide a connection method and a radio base station that can determine parameters used in cells under the relay node RN in consideration of surrounding conditions.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a figure which shows an example of "PRACH-Config" used with the mobile communication system which concerns on the 1st Embodiment of this invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention. 3 is a flowchart showing an operation of the mobile communication system according to the first embodiment of the present invention.

(Mobile communication system according to the first embodiment of the present invention)
A mobile communication system according to a first embodiment of the present invention will be described with reference to FIG. 1 to FIG.

  The mobile communication system according to the present embodiment is an LTE-Advanced mobile communication system, as shown in FIG. 1, a mobility management node MME (Mobility Management Entity), a radio base station DeNB, a relay node RN, And an O & M (Operation & Maintenance) server.

  The relay node RN is configured to perform radio communication with the radio base station DeNB via the Un interface and to perform radio communication with the mobile station UE via the Uu interface.

  As illustrated in FIG. 2, the radio base station DeNB includes an acquisition unit 11, a management unit 12, a reception unit 13, a determination unit 14, and a transmission unit 15.

  The acquisition unit 11 is configured to acquire predetermined parameters used in the peripheral radio base stations eNB / DeNB and the relay node RN from the peripheral radio base stations eNB / DeNB via the X2 interface.

  For example, the acquisition unit 11 uses, as the predetermined parameter, PCI (Physical Cell Identity), PRACH-Config, bandwidth, TAC (Tracking Area Code) used in the cells under the control of the neighboring radio base stations eNB / DeNB and the relay node RN. ) And the like.

  Moreover, the acquisition part 11 is comprised so that the interference amount in the cell under the surrounding radio base station eNB / DeNB or relay node RN may be acquired as a predetermined parameter.

  The acquisition unit 11 uses the “X2 Application Protocol (TS36.423 specification) for the above-described predetermined parameters (including the interference amount) used in the neighboring radio base stations eNB / DeNB and cells under the relay node RN, excluding TAC. Reference) ”.

  The management unit 12 is configured to manage the predetermined parameter acquired by the acquisition unit 11.

  The receiving unit 13 is configured to receive a message transmitted by the relay node RN or the mobility management node MME in a connection procedure between the relay node RN and the radio base station DeNB.

  For example, in the connection procedure between the relay node RN and the radio base station DeNB, the reception unit 13 transmits a radio section (hereinafter referred to as “Un-interface”) from the relay node RN through “RRC RN (UE) Capability Information”. , Un radio section), supported bandwidth in the radio section in which the RN-Uu interface is used (hereinafter referred to as RN-Uu radio section), and “Half Duplex inband relay (Type 1 relay)”. ) ”, Information on whether or not“ Full Duplex inband relay (Type 1b relay) ”is supported, and the like. It is configured as follows.

  Here, “Half Duplex inband relay” means that the relay node RN uses the same operation frequency and bandwidth in the RN-Uu radio section and the Un radio section, and the transmission timing in the RN-Uu radio section and the Un radio section. This is an operation for time division of reception timing.

  On the other hand, the “Full Duplex inband relay” is performed by the relay node RN using the same operation frequency and bandwidth in the RN-Uu radio section and the Un radio section, and the transmission timing in the RN-Uu radio section and the reception in the Un radio section. This is an operation that does not divide the timing.

  The relay node RN that supports the “Full Duplex inband relay” is a high-performance relay node RN that includes a high-performance filter or that divides the transmission antenna and the reception antenna.

  Note that “outband relay” is an operation using different operation frequencies and bandwidths in the RN-Uu radio section and the Un radio section in the relay node RN.

  Based on the above-described predetermined parameter managed by the management unit 12, the capability information of the relay node RN, and the like, the determination unit 14 uses the PCI, PRACH-Config, relay node, and the like used in the cells under the relay node RN. It is configured to determine RS (Reference Signal) transmission power, bandwidth, TAC, reception noise figure, etc. at the relay node RN in the RN.

  In addition, the determination unit 14 performs “outband relay”, “Half Duplex inband relay” in the relay node RN based on the above-described capability information of the relay node RN and the bandwidth that can be used in the Un radio section acquired from the O & M server. ”Or“ Full Duplex inband relay ”is determined.

  Furthermore, the determination unit 14 determines the operating frequency and bandwidth used in the RN-Uu radio section based on the above-described capability information of the relay node RN and the bandwidth usable in the Un radio section acquired from the O & M server. It may be configured to.

  The transmission unit 15 is configured to transmit a predetermined message to the relay node RN and the mobility management node MME in the connection procedure between the relay node RN and the radio base station DeNB.

  For example, in the connection procedure between the relay node RN and the radio base station DeNB, the transmission unit 15 uses a PCI used in a cell under the relay node RN via the “RRC Connection Reconfiguration” for the relay node RN, It is configured to notify at least one of PRACH-Config, RS transmission power at the relay node RN, bandwidth, TAC, reception noise figure at the relay node RN, and the like.

  Here, the transmission unit 15 transmits, to the relay node RN, the transmission power of the RS, the PCI used in the cell under the relay node RN, the PRACH-Config, and the RS via the newly defined RRC message. Alternatively, it may be configured to notify at least one of a bandwidth, a TAC, a reception noise figure at the relay node RN, and the like.

  FIG. 3 shows an example of such PRACH-Config.

  In addition, in the connection procedure between the relay node RN and the radio base station DeNB, the transmission unit 15 uses the operation frequency used in the RN-Uu radio section via the “RRC Connection Reconfiguration” for the relay node RN and It may be configured to notify about the bandwidth.

  Further, the transmission unit 15 may be configured to notify the relay node RN of the operating frequency and bandwidth used in the RN-Uu radio section via a newly defined RRC message.

  Hereinafter, a connection procedure between the relay node RN and the radio base station DeNB in the mobile communication system according to the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 4 and 5, in step S1001 (S101), the relay node RN performs cell search processing similarly to the function of the mobile station UE, and is provided by the radio base station DeNB in the Un radio section. The selected carrier is selected, and “RRC Connection Request” is transmitted to the radio base station DeNB.

  In step S1002, the radio base station DeNB transmits “RRC Connection Setup” to the relay node RN.

  In Step S1003, the relay node RN transmits “RRC Connection Setup Complete” including “Attach Request” to the radio base station DeNB.

  In step S1004, the radio base station DeNB transmits “Initial UE Message” to the mobility management node MME.

  In step S1005, "Authentication / Security" processing is performed.

  In step S1006, the mobility management node MME transmits “Initial Context Setup Request” including “Attach Accept” to the radio base station DeNB.

  In step S1007, the radio base station DeNB transmits “RRC UE (RN) Capability Enquiry” to the relay node RN.

  In step S1008, the relay node RN transmits “RRC UE (RN) Capability Information” to the radio base station DeNB.

  In step S1009, the radio base station DeNB transmits “UE (RN) Capability Info Indication” to the mobility management node MME.

  The radio base station DeNB transmits “Security Mode Command” to the relay node RN in Step S1010, and transmits “RRC Connection Reconfiguration” including “Attach Accept” in Step S1011.

  Here, when the radio base station DeNB receives “RRC UE (RN) Capability Information”, as shown in FIG. 5, in step S103, the radio base station DeNB reduces traffic or reduces the amount of interference, or “outband relay”. Or, in order to perform “inband relay”, it is determined whether or not the relay node RN should be caused to fiber another carrier in the Un radio section.

  If “Yes”, the operation proceeds to step S104. If “No”, the operation proceeds to step S105.

  In step S104, the radio base station DeNB transmits the “RRC Release with Redirection” to the relay node RN, thereby causing the relay node RN to transition to another carrier. Thereafter, the operation returns to step S102.

  On the other hand, in step S105, the radio base station DeNB sets “outband relay” in the relay node RN based on the capability information of the relay node RN described above and the bandwidth that can be used in the Un radio section acquired from the O & M server. Decide whether it can be used.

  In the case of “Yes”, the operation proceeds to step S106, and in the case of “No”, the operation proceeds to step S107.

  In step S106 (step S1011), the radio base station DeNB determines an operation frequency and a bandwidth to be used in the RN-Uu radio section in order to perform “outband relay”, and includes them in “RRC Connection Reconfiguration”.

  Here, the radio base station DeNB uses the transmission power, bandwidth, TAC, and the transmission power of the PCI, PRACH-Config, and RS (Reference Signal) in the relay node RN that are used in the cells under the relay node RN determined as described above. , At least one of the received Noise Figures at the relay node RN may be included.

  In step S107, the radio base station DeNB determines whether or not “Full Duplex inband relay” can be used in the relay node RN based on the capability information of the relay node RN described above.

  If “Yes”, the operation proceeds to step S 108, and if “No”, the operation proceeds to step S 109.

  In step S108 (step S1011), the radio base station DeNB performs the same operation frequency and bandwidth as the operation frequency and bandwidth used in the Un radio section in the RN-Uu radio section in order to perform “Full Duplex inband relay”. The operating frequency and bandwidth to be used are included in “RRC Connection Reconfiguration”.

  Here, the radio base station DeNB uses the transmission power, bandwidth, TAC, and the transmission power of the PCI, PRACH-Config, and RS (Reference Signal) in the relay node RN that are used in the cells under the relay node RN determined as described above. , At least one of the received Noise Figures at the relay node RN may be included.

  In step S109, the radio base station DeNB determines whether or not “Half Duplex inband relay” can be used in the relay node RN based on the capability information of the relay node RN described above.

  If “Yes”, the operation proceeds to step S110, and if “No”, the operation proceeds to step S111.

  In step S110 (step S1011), the radio base station DeNB performs the same operation frequency and bandwidth as the operation frequency and bandwidth used in the Un radio section to perform “Half Duplex inband relay” in the RN-Uu radio section. The operating frequency and bandwidth to be used are included in “RRC Connection Reconfiguration”.

  Here, the radio base station DeNB uses the transmission power of the PCI, PRACH-Config, and RS (Reference Signal) in the relay node RN to be used in the cell under the relay node RN determined as described above in “RRC Connection Reconfiguration”. Alternatively, at least one of bandwidth, TAC, and reception noise figure at the relay node RN may be included.

  Also, the radio base station DeNB may set an MBSFN (MBMS Single Frequency Network) subframe in the RN-Uu radio section, and include the setting result in “RRC Connection Reconfiguration”.

  The radio base station DeNB may transmit the setting result by including it in a newly defined RRC message instead of “RRC Connection Reconfiguration”.

  In step S1012, the relay node RN transmits “Security Mode Complete” to the radio base station DeNB, and in step S1013, transmits “RRC Connection Reconfiguration Complete”.

  In step S1014, the radio base station DeNB transmits “Initial Context Setup Response” to the mobility management node MME.

  In step S1015, the relay node RN transmits “Attach Complete” to the mobility management node MME.

  In step S1016, the relay node RN downloads setting information (Node Configuration) from the O & M server.

  In step S1017, the relay node RN establishes an S1 / X2 interface with the radio base station DeNB.

  According to the mobile communication system according to the present embodiment, the radio base station DeNB can set parameters used in cells under the relay node RN in consideration of surrounding conditions and the like.

  The characteristics of the present embodiment described above may be expressed as follows.

  A first feature of the present embodiment is a connection method in which the relay node RN connects to the radio base station DeNB, and the radio base station eNB uses a PCI used in a cell under the relay node RN with respect to the relay node RN, PRACH-Config (physical random access channel setting information), RS (reference signal) transmission power, bandwidth, TAC (tracking area code) in the relay node RN, and reception noise figure (noise figure) in the relay node RN The gist is to have a step of notifying at least one.

  A second feature of the present embodiment is a radio base station DeNB to which the relay node RN can be connected. In the connection procedure between the relay node RN and the radio base station DeNB, the relay node RN is subordinate to the relay node RN. PCI, PRACH-Config (physical random access channel setting information), RS (reference signal) transmission power, bandwidth, TAC (tracking area code) in relay cell RN, and reception noise in relay node RN The gist of the present invention is to include a transmission unit 15 (notification unit) configured to transmit “RRC Connection Reconfiguration” for notifying at least one of the figures (noise figure) or a newly defined RRC message.

  The operations of the mobility management node MME, the radio base station DeNB, the relay node RN, and the mobile station UE described above may be implemented by hardware or may be implemented by a software module executed by a processor, You may implement by the combination of both.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobility management node MME, the radio base station DeNB, the relay node RN, or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the mobility management node MME, the radio base station DeNB, the relay node RN, or the mobile station UE.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station MME ... mobile management node RN ... relay node DeNB ... radio base station 11 ... acquisition unit 12 ... management unit 13 ... reception unit 14 ... determination unit 15 ... transmission unit

Claims (4)

A connection method in which a relay node connects to a radio base station,
Step A in which the radio base station obtains a predetermined parameter used in a peripheral radio base station or a peripheral relay node located in the vicinity of the radio base station from a peripheral radio base station located in the vicinity of the radio base station. When,
Step B in which the radio base station receives capability information of the relay node from the relay node;
Based on the acquired predetermined parameter and the received capability information, the radio base station uses PCI, physical random access channel setting information, reference signal transmission power, bandwidth in the relay node. Determining at least one parameter of a width, a tracking area code, and a reception noise figure in the relay node, and determining the parameter determined for the relay node in a connection procedure between the relay node and the radio base station And a process C for notifying the above. The connection method according to claim 1, wherein, in the step C , the radio base station performs the notification via an RRC message. A radio base station to which a relay node can be connected,
An acquisition unit configured to acquire a predetermined parameter used in a peripheral radio base station or a peripheral relay node located in the vicinity of the radio base station from a peripheral radio base station located in the vicinity of the radio base station When,
A receiver configured to receive capability information of the relay node from the relay node;
Based on the acquired predetermined parameter and the received capability information, PCI used in the cell under the relay node, setting information of the physical random access channel, transmission power of the reference signal in the relay node, bandwidth, tracking area code, And a determining unit configured to determine at least one parameter of a reception noise figure at the relay node;
In connection procedure with the wireless base station and the relay node, a radio base station, characterized by comprising relative to the relay node, and a notification unit configured to notify the determined parameters.   The radio base station according to claim 3, wherein the notification unit is configured to perform the notification via an RRC message.

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